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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2df1f8742249c563cb336e4c2be6196c04e9d8ea86cdeecf88c731c3b5ba440' 
  AND token = 'zc9TVTi3ks1SJgwEByex46eSnTHTUl4p/MRQ+oRQkow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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