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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0dde5d94fec7e1a781e94bc2a90a971d0f754549571d032e0a30075024ed7d' 
  AND token = 'Ts5UTxcYR/T+KfIuo7XCZp/q7J2v/DlSyfGxXf2sGac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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