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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699685ff7d7e62fefda206686e678f1b3f0979cacfc91a631872620189f2ca9b' 
  AND token = 'Pe+wrKADqSUIPqm8/gZvyCzz7wmD2L8c3zqRDtIm7os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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