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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a7e558586e8eb20f48d58d149d73c13deeb0cfb23f7d7ab5aa4f02c63d4982' 
  AND token = 'TO7y4cEHp95xLUR75HOL3S9q7Kcz7XWjETlLtuADwSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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