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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e581f998ba2961679f1d2129c1fa4a0e4d8b84683a937f1a02f1991270ffff5b' 
  AND token = '5qNCma6Npo14t70bshCTYgJJT+DG8X8/BeWmF+6W6zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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