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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f51c531f314448bbe9a256170b7eefc651ed59778c4955282226620455b38fc' 
  AND token = 'M+Q/iaZhPZf2SN6zYCDAOFYcm8IG+0/9d3O8x3pS+FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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