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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bf09119bf4188ff84364066d6b4c23e913943dc59880309d51135fdeeff5b5' 
  AND token = 'aBZiQ8T3EZLEwpSKadtSwDShE3uenB6uM1W6ANEcrQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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