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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f6ae41fc6634cad817712de685a0d3869737339112a406791c6f757d46a18f' 
  AND token = 'IzDCOK2cgIO7NQgU8pSsCydO3ud18MOkizwhu+XU4YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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