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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5a7949ce4435b94887c5baaae878119128ac2eeb2aea47137e27f964bcc523' 
  AND token = 'xQywAbVqU1FV4tEe6qQ3beFj2VBr3oIP3BZ4RNQk60Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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