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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bef526993d595cddf21916868dd4fd7312ad2805ccf3c5cd26db21b654d3734' 
  AND token = 'RkBGOZ/5qit7iVrH7XiyKt/Ls7CV11kwanhRc2NtDC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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