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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6229eead5b154aea67cfe192d45b32c1d083e52198ca029f8a97e936598b28c8' 
  AND token = 'aH1/8It1EUvMss6fbu2XscKO+BlpCL8+3ZKf0urBCTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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