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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983c6feaba0d5f28a0af18e116a6aa4286d35711a3c8582effd93898cdc0f707' 
  AND token = 'CDgnDZRbGlr8okM8gKktUvWF+6QOpb7TykAEHO46NZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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