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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99813a377c8f05e070c78520876886df9c849f7cbdf1dfb98ce8619c969a2c52' 
  AND token = 'vxnoctIn7oy/dNmLy+zq3kV18x4xxnHXfTAfB0reVA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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