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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530cd486806f02cbcfc8e327cdc46cf2326e3c07e84d58c1520bcf8820283122' 
  AND token = 'e+S2P7Jzznxhx2omKUrv7NIiQX8HMGSb4zybGPf1u1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}