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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccf26ef26c6c7a38858ae20460bd4ebe0e3b4973ea235525175e04094fccd9e' 
  AND token = 'mWSIvAD0ddatQp/+AfCG4+qoC6Gn87qdl1nFnz9QDTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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