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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b05e2c08cecc8ab27a03b7090cc6e33803f26c7ace879bb51b67ec5ca8b3a1' 
  AND token = 'fjxMeglvoEjxBp1Ubb1vz6/d3LMsnD0uR50I4v1H8jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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