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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f554891e2d30f877b73b829c50537bfcad082664ddb831bd3910699b6a3f7e7' 
  AND token = 'ZSbda9O7rbXIDlaX3BBsx/qVonFI5zkxmrl8umNmnFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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