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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dd3a1592c6540f6bd798e1e238aae3b16820f4898441a205506b0c1485da26' 
  AND token = '6Y+MAl5U47lfE78n4qMGfgD0fomUAs6BayIWt2VMgy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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