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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc34c4967945f6403de67d47a948e754392949e5313d347b2ceab24317a0c61' 
  AND token = 'dVZ4a24Gn3Ym5Y4LmFYmxRcqCwz4stu7fI4ak838j/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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