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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde520c9c4aa75e0f3c88f56caca8b8c3a1ad4b6e0fc059174f640e62c0d716d' 
  AND token = 'fsTL6bXTPbOOFRY5rFXvAkdbOctRWBkeBiYG+5nDRak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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