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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c56999edde7af5de41cbd6a47a1d0c4d4f89617c8493c1028488c71c9670ab3' 
  AND token = 'AzmUvFpgy40KGrdxdP6hh9D2546RZPkmmj/DXvIRO9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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