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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc0aabb800b7ac842fedd4b28dd973cc96872f66ccce7ff8c1b9d1be9573b65' 
  AND token = 'MttCInb80YN8ZWLomi5ScZtZew96ybwh/hsX9ohq9Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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