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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fdbd541577408b4931fc931a5542697ff26f5bbd52e75630c5dd458ed6023c' 
  AND token = 'AXX+wtExatJAI7dg/4hWSFjBwtdo56+znWzagBPoMyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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