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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbe825e669453791da86767f3cb75b6e0e54ae75ea0e39eb488e4f6e6421c34' 
  AND token = 'tAfImJKabI+9WBHPAtwUQugTnOmwaedFEDmGrQX86YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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