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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61edd7b0c03deb0589dde94f662c28f8759e873d0bc2fd5a8ad6127ee15890a' 
  AND token = 'Ab8yhsURcyfqkQdYVB5qVMqIIuB5WHogl2GxyrWlkdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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