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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb08b35b5e2c9abdd487837b1e5caaf4b83e09bff427ac7a8f5a8e0d27f80357' 
  AND token = 'fL9ZHVyd8KP9Ki34gxUQ7wkSe/rr0bIGHDvIdCUvbtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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