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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e7046e8a0ec8b400db035d87a789d94c48b323cbdd6367de1c4354cba152ff' 
  AND token = 'OHjupstiF8U9oVy3aYic3wH+Z1SznLoBEIn6DkgtoR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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