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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7055c3f944a3813ee0fecc28bdb58dee5c0c90c3f2d09e445b38152a0e6cd5ab' 
  AND token = 'K2B4WNpJjjRbNplfSCGKuRZ4Wh6zJm7fmUDz8m9wNoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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