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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c14ecc47136153ea68152193c6447ee8761cd2b4430c02095c3676e89a2a02' 
  AND token = '9susqiKWESndUmGCfo9BDcuh1x6XAFV96EiT69jtoSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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