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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f44483cc37f8e2a161cace049c2e01ceedff004488689cb1eefe418dcc4a44' 
  AND token = 'ccKNDs5k01nHean8a+yy+uku4XNK9ag/0Fo2L4QNILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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