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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8020ff5dadbfbe901d7a5833058c2e89ffae6a1b6c1950bc0c706f7c303c46ce' 
  AND token = 'i6VfFXB7Dn/WTL9c4uzFOKichd3aB6jJcRC1T7jSk74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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