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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c3d25d65e0ad3354c36aa8f0208506862e759c6f7ece8cb7f092e4fb7b0850' 
  AND token = 'rlj1m9YOV2oCRMS6isfpkvu7AqlGEKt2fD2DskILRnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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