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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bdbdcfd5061634b6cb8cf274e92c478fa7a837e7c7c4f872d541e90c89d37a' 
  AND token = 'R/azXPbwcmQkIlWVQ+qmLs+W6cnN6wuN5LHa68GXqds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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