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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ea700f453b04aaf65f82c753ccbb650cbfaff2f4e283229d1170643f1efef7' 
  AND token = 'sA03mn4eYtBEO+/HeQ15uNcgt4uI5/dOFWzDWyqbve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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