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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17520b14d3cbc97c80ab62e695cee1ebab0e9091a1262c1e4fe17ccf9db318d8' 
  AND token = 'j9nPdlHVQA/d3Q4wjz8Qca+1cIxZq2RiUk81Ww6OfQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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