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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ca7152596c5774d5733e9d43ea983ea92664e01e8e2932d5a61e0e97e04b84' 
  AND token = 'ADBX+qmFAv5+8I0LbQowKunMwqaukqqusPJOIW1vATg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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