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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011638d0a88da8ae634a6ca6f6887e21e6d6acdf9d094a92f9e22ca4ecd0240c' 
  AND token = 'eu27GyxOOJ7bjjxIqrmCwmuNs5BaYEpQgEt4e/bgXFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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