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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e9830f51bcd1db6cd1768959ca743623ce7a35b0a0cc8c16b1d5f7f372ffe8' 
  AND token = 'hcVFBm3ITsOXDUfJwe4/JvEISWr82jazSa3ZOuuvNxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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