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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edec040149bbd51c1c04c20f74014e220e47e325704e782eef6084f90ba50a20' 
  AND token = 'L3ohhc3QtJHZF6DE3ihXNjzgczg1v2xirB4uXeKIKYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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