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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32538ab54270628749adb81a194e62c2a3acbc27e8e6c21ac6ca8186a21a19c' 
  AND token = '+Fh9njrOrnNlSsvZpqIGyA2dzaDETV/D5V3AU2IAQk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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