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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57811a1842188ace16e933ff09ea5084e30f3baad70b2fcb51f1d3521a091ec1' 
  AND token = 'XP05EB+BhJ+FxcQvl7K2V/8crshoN9JE3be7l9ajMRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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