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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cc60c3fbb2bc7af3d9dfd7fb64241823e70539bdaa2b4094a0e091f8352962' 
  AND token = 'hkHnLBiCW+skqPDFzDEYgKR092p7RvCfzC0uBQUt2NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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